I was planning on using two Ampmaster 3000s in a closed loop system but maybe the Tunze is a better options.
Close by, the Tunze will provide a better option then the Ampmaster 3000. I don't know how far the pattern is to completely cover your tank. The Tunze will be quieter then the Amp for sure. Not to mention you don't have to worry about plumbing leaks later on.